"Please leave a message for Joe and I." -- WRONG!!!
"Please leave a message for Joe and myself." -- WRONG!!!

I know your mama scolded you when you said "Me and Billy is goin' to the store," but that's a different rule. According to that rule, "Billy and I are going to the store" is more proper than "I and Billy are going to the store." Two issues here: one is that you should put yourself at the end of a list; the other is that you aren't a "Me" if you are in the subject, you are an "I." You wouldn't say "Me am going to the store," you'd say "I am going to the store."

Latin Words and Plurals

These words come straight from Latin. The singular and plural forms are shown.

Singular

Plural

Datum

Data

Agendum

Agenda

Adendum

Adenda

Matrix

Matrices

Cactus

Cacti

Alumnus

Alumni

Alumna

Alumnae

So, correct English is:

"The data don't fit the expected results."
"This datum is so far from the rest of the data, that it must be wrong."
"Did you collect all the data?"
"The data are incorrect."

This is just how you would use the word "Sheep," although, sheep is the same form when sigular or plural.

"The sheep are all lost."

"I have an item to add to the Agenda."

"Agendas" is technically incorrect. "Cactuses" is incorrect, but is, sadly, more accepted these days.

Lost Words

These are everyday words, that used to mean something else. That other usage is gone, replaced by weaker meanings.

Fantastic -- depicting fantasy, unbelievable because it would make sense only in fantasy (fantasy being a dreamed up reality, or an imagined existence). (Now it may mean just "good," adjective, or "really well," adverb.)

Extraordinary -- not ordinary, beyond ordinary

Amazing -- causing amazement, wonder, disbelief

Horrific -- causing horror

Terrific -- causing terror, terrifying. (Now it means "good.")

Great -- large or extensive. "A great man" used to mean a man whose contributions were so important, that his very stature seemed to be bigger than other humans. (Now it can just mean "good.")

Wonderful -- causing wonder. (Now it means "good.")

The Correctocrats

I won't have some borgeios correctocrats telling me that I don't know English. Whether it is using "myself" in their pompous, assured-nervousness, or if it is correcting my spelling on words used identically by Shakespeare, or if it is attempting to correct me when I use the word "me" correctly. I won't have it.